The Arizal explains in Etz Chaim, Palace of Adam Kadmon, how the sefirot have both linear and circular aspects. He also connects this to the soul levels, the nefashot being the circular aspects and the ruachim the linear.
The circular aspects function the way that holiness is more and more distant from the center, whereas the linear aspects function the opposite, where holiness is more and more internal (the clothing of the partzufim on top of eachother).
However, it's not clear to me how these aspects (circular and linear) are related to each other. As humans we have both a nefesh and a ruach. How do these aspects relate? Would appreciate if someone could explain it to me.